9 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:P/I:P/A:C
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10 High
AI Score
Confidence
High
0.007 Low
EPSS
Percentile
80.9%
CISA is aware of a public report, known as โOT:ICEFALLโ that details vulnerabilities found in multiple operational technology (OT) vendors. CISA is issuing this advisory to provide notice of the reported vulnerabilities and identify baseline mitigations for reducing risks to these and other cybersecurity attacks.
Successful exploitation of this vulnerability could allow an unauthorized attacker to change configurations, manipulate services, or cause a denial-of-service condition.
The following versions of the classic line industrial controllers are affected:
The affected product does not feature a function to authenticate communication protocols, which could allow an unauthorized attacker to change or download the configuration, start or stop services, update or modify the firmware, or shut down the device.
CVE-2019-9201 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
Sergiu Sechel reported this vulnerability to Phoenix Contact.
Daniel dos Santos and Jos Wetzels of Forescout Technologies reported this vulnerability to CISA.
Phoenix Contact has provided the following mitigations and workarounds:
For detailed information on Phoenix Contactโs recommendations for measures to protect network-capable devices, please refer to their application note for classic line controllers:
Measures to protect devices based on classic control technology
Controller supporting CPU services or WBM for disabling communication protocols:
CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
Additional mitigation guidance and recommended practices are publicly available on the ICS webpage on cisa.gov/ics in the Technical Information Paper, ICS-TIP-12-146-01BโTargeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to CISA for tracking and correlation against other incidents.
No known public exploits specifically target this vulnerability.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-9201
cisa.gov/ics
cisa.gov/ics
cwe.mitre.org/data/definitions/306.html
dam-mdc.phoenixcontact.com/asset/156443151564/74777de2d270be4cb4828ee57173dbd0/Application-note_110637_en_00.pdf
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
twitter.com/CISAgov
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www.cisa.gov/uscert/ics/recommended-practices
www.cisa.gov/uscert/ics/tips/ICS-TIP-12-146-01B
www.cisa.gov/uscert/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
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mailto:?subject=Phoenix%20Contact%20Classic%20Line%20Industrial%20Controllers&body=www.cisa.gov/news-events/ics-advisories/icsa-22-172-05
9 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:P/I:P/A:C
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10 High
AI Score
Confidence
High
0.007 Low
EPSS
Percentile
80.9%